Quote:
Originally Posted by GH85Carrera
The theory I heard was the moon was struck by a really big asteroid or object, and it melted much of the far side and erased a lot of older craters, and made the moon lopsided. The earth's gravity locked one side into constant view of the earth.
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A current theory is that Earth was hit by a large body (Theia)... maybe a wayward 'planet' perhaps as large as Mars.
A chunk broke off, becoming the moon.
https://en.wikipedia.org/wiki/Giant-impact_hypothesis
Earth's moon is very, very unique... it is huge relative to the planet is circles.
Our moon is gradually moving farther and farther away from earth.